Luanita

Hi all, please can you assist me as I am not getting information on the E2 error code. Everytime when switching it on, as soon as we switch the heater on, it runs for less than a minute and the it stops and displays E2. The guy I purchased it from said I must unplug and wait 10 seconds and switch on again. At times I have to do this 26 times, before it starts running. What can the fault be? The filter is clean, water level is correct. I have no idea where to look.